var createError = require('http-errors')
var express = require('express')
var path = require('path')
var cookieParser = require('cookie-parser')
var logger = require('morgan')
var bodyParser = require('body-parser')

var Routers = require('./routes/routers')
var User = require('./routes/users')

var app = express()

// view engine setup
app.set('views', path.join(__dirname, 'views'))
app.set('view engine', 'jade')

app.all('*', function(req, res, next) {
	res.header('Access-Control-Allow-Origin', '*')
	res.header('Access-Control-Allow-Headers', 'Content-Type, Content-Length, Authorization, Accept, X-Requested-With')
	res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS')
	res.header('Content-Type', 'application/json; charset=utf-8')

	if (req.method == 'OPTIONS') {
		res.send(200)
	} else {
		next()
	}
})

app.use(logger('dev'))
app.use(express.json())
app.use(express.urlencoded({ extended: false }))
app.use(cookieParser())
app.use(express.static(path.join(__dirname, 'public')))
app.use(bodyParser.urlencoded({ extended: false }))

app.use('/user', User)
app.use('/routers', Routers)

// catch 404 and forward to error handler
app.use(function(req, res, next) {
	res.writeHead(200, { 'Content-Type': 'application/json;charset=utf8' })
	next(createError(404))
})

// error handler
app.use(function(err, req, res, next) {
	// set locals, only providing error in development
	res.locals.message = err.message
	res.locals.error = req.app.get('env') === 'development' ? err : {}

	// render the error page
	res.status(err.status || 500)
	res.render('error')
})

app.use(function(req, res, next) {
	res.status(404)
	try {
		return res.json('NOT FOUND')
	} catch (e) {
		console.error('404 set header after sent')
	}
})

app.use(function(err, req, res, next) {
	if (!err) {
		next()
	} else {
		res.status(500)
		try {
			return res.json(err.message || '500 SERVER ERROR')
		} catch (e) {
			console.error('500 set header after sent')
		}
	}
})

module.exports = app
